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15#include <linux/module.h>
16#include <linux/platform_device.h>
17#include <linux/rtc.h>
18#include <linux/err.h>
19#include <linux/delay.h>
20
21#include <linux/mfd/da9052/da9052.h>
22#include <linux/mfd/da9052/reg.h>
23
24#define rtc_err(rtc, fmt, ...) \
25 dev_err(rtc->da9052->dev, "%s: " fmt, __func__, ##__VA_ARGS__)
26
27#define DA9052_GET_TIME_RETRIES 5
28
29struct da9052_rtc {
30 struct rtc_device *rtc;
31 struct da9052 *da9052;
32};
33
34static int da9052_rtc_enable_alarm(struct da9052_rtc *rtc, bool enable)
35{
36 int ret;
37 if (enable) {
38 ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG,
39 DA9052_ALARM_Y_ALARM_ON|DA9052_ALARM_Y_TICK_ON,
40 DA9052_ALARM_Y_ALARM_ON);
41 if (ret != 0)
42 rtc_err(rtc, "Failed to enable ALM: %d\n", ret);
43 } else {
44 ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG,
45 DA9052_ALARM_Y_ALARM_ON|DA9052_ALARM_Y_TICK_ON, 0);
46 if (ret != 0)
47 rtc_err(rtc, "Write error: %d\n", ret);
48 }
49 return ret;
50}
51
52static irqreturn_t da9052_rtc_irq(int irq, void *data)
53{
54 struct da9052_rtc *rtc = data;
55
56 rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);
57
58 return IRQ_HANDLED;
59}
60
61static int da9052_read_alarm(struct da9052_rtc *rtc, struct rtc_time *rtc_tm)
62{
63 int ret;
64 uint8_t v[2][5];
65 int idx = 1;
66 int timeout = DA9052_GET_TIME_RETRIES;
67
68 ret = da9052_group_read(rtc->da9052, DA9052_ALARM_MI_REG, 5, &v[0][0]);
69 if (ret) {
70 rtc_err(rtc, "Failed to group read ALM: %d\n", ret);
71 return ret;
72 }
73
74 do {
75 ret = da9052_group_read(rtc->da9052,
76 DA9052_ALARM_MI_REG, 5, &v[idx][0]);
77 if (ret) {
78 rtc_err(rtc, "Failed to group read ALM: %d\n", ret);
79 return ret;
80 }
81
82 if (memcmp(&v[0][0], &v[1][0], 5) == 0) {
83 rtc_tm->tm_year = (v[0][4] & DA9052_RTC_YEAR) + 100;
84 rtc_tm->tm_mon = (v[0][3] & DA9052_RTC_MONTH) - 1;
85 rtc_tm->tm_mday = v[0][2] & DA9052_RTC_DAY;
86 rtc_tm->tm_hour = v[0][1] & DA9052_RTC_HOUR;
87 rtc_tm->tm_min = v[0][0] & DA9052_RTC_MIN;
88 rtc_tm->tm_sec = 0;
89
90 ret = rtc_valid_tm(rtc_tm);
91 return ret;
92 }
93
94 idx = (1-idx);
95 msleep(20);
96
97 } while (timeout--);
98
99 rtc_err(rtc, "Timed out reading alarm time\n");
100
101 return -EIO;
102}
103
104static int da9052_set_alarm(struct da9052_rtc *rtc, struct rtc_time *rtc_tm)
105{
106 struct da9052 *da9052 = rtc->da9052;
107 unsigned long alm_time;
108 int ret;
109 uint8_t v[3];
110
111 ret = rtc_tm_to_time(rtc_tm, &alm_time);
112 if (ret != 0)
113 return ret;
114
115 if (rtc_tm->tm_sec > 0) {
116 alm_time += 60 - rtc_tm->tm_sec;
117 rtc_time_to_tm(alm_time, rtc_tm);
118 }
119 BUG_ON(rtc_tm->tm_sec);
120
121 rtc_tm->tm_year -= 100;
122 rtc_tm->tm_mon += 1;
123
124 ret = da9052_reg_update(da9052, DA9052_ALARM_MI_REG,
125 DA9052_RTC_MIN, rtc_tm->tm_min);
126 if (ret != 0) {
127 rtc_err(rtc, "Failed to write ALRM MIN: %d\n", ret);
128 return ret;
129 }
130
131 v[0] = rtc_tm->tm_hour;
132 v[1] = rtc_tm->tm_mday;
133 v[2] = rtc_tm->tm_mon;
134
135 ret = da9052_group_write(da9052, DA9052_ALARM_H_REG, 3, v);
136 if (ret < 0)
137 return ret;
138
139 ret = da9052_reg_update(da9052, DA9052_ALARM_Y_REG,
140 DA9052_RTC_YEAR, rtc_tm->tm_year);
141 if (ret != 0)
142 rtc_err(rtc, "Failed to write ALRM YEAR: %d\n", ret);
143
144 return ret;
145}
146
147static int da9052_rtc_get_alarm_status(struct da9052_rtc *rtc)
148{
149 int ret;
150
151 ret = da9052_reg_read(rtc->da9052, DA9052_ALARM_Y_REG);
152 if (ret < 0) {
153 rtc_err(rtc, "Failed to read ALM: %d\n", ret);
154 return ret;
155 }
156
157 return !!(ret&DA9052_ALARM_Y_ALARM_ON);
158}
159
160static int da9052_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm)
161{
162 struct da9052_rtc *rtc = dev_get_drvdata(dev);
163 int ret;
164 uint8_t v[2][6];
165 int idx = 1;
166 int timeout = DA9052_GET_TIME_RETRIES;
167
168 ret = da9052_group_read(rtc->da9052, DA9052_COUNT_S_REG, 6, &v[0][0]);
169 if (ret) {
170 rtc_err(rtc, "Failed to read RTC time : %d\n", ret);
171 return ret;
172 }
173
174 do {
175 ret = da9052_group_read(rtc->da9052,
176 DA9052_COUNT_S_REG, 6, &v[idx][0]);
177 if (ret) {
178 rtc_err(rtc, "Failed to read RTC time : %d\n", ret);
179 return ret;
180 }
181
182 if (memcmp(&v[0][0], &v[1][0], 6) == 0) {
183 rtc_tm->tm_year = (v[0][5] & DA9052_RTC_YEAR) + 100;
184 rtc_tm->tm_mon = (v[0][4] & DA9052_RTC_MONTH) - 1;
185 rtc_tm->tm_mday = v[0][3] & DA9052_RTC_DAY;
186 rtc_tm->tm_hour = v[0][2] & DA9052_RTC_HOUR;
187 rtc_tm->tm_min = v[0][1] & DA9052_RTC_MIN;
188 rtc_tm->tm_sec = v[0][0] & DA9052_RTC_SEC;
189
190 ret = rtc_valid_tm(rtc_tm);
191 return ret;
192 }
193
194 idx = (1-idx);
195 msleep(20);
196
197 } while (timeout--);
198
199 rtc_err(rtc, "Timed out reading time\n");
200
201 return -EIO;
202}
203
204static int da9052_rtc_set_time(struct device *dev, struct rtc_time *tm)
205{
206 struct da9052_rtc *rtc;
207 uint8_t v[6];
208 int ret;
209
210
211 if ((tm->tm_year < 100) || (tm->tm_year > 163))
212 return -EINVAL;
213
214 rtc = dev_get_drvdata(dev);
215
216 v[0] = tm->tm_sec;
217 v[1] = tm->tm_min;
218 v[2] = tm->tm_hour;
219 v[3] = tm->tm_mday;
220 v[4] = tm->tm_mon + 1;
221 v[5] = tm->tm_year - 100;
222
223 ret = da9052_group_write(rtc->da9052, DA9052_COUNT_S_REG, 6, v);
224 if (ret < 0)
225 rtc_err(rtc, "failed to set RTC time: %d\n", ret);
226 return ret;
227}
228
229static int da9052_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
230{
231 int ret;
232 struct rtc_time *tm = &alrm->time;
233 struct da9052_rtc *rtc = dev_get_drvdata(dev);
234
235 ret = da9052_read_alarm(rtc, tm);
236 if (ret < 0) {
237 rtc_err(rtc, "failed to read RTC alarm: %d\n", ret);
238 return ret;
239 }
240
241 alrm->enabled = da9052_rtc_get_alarm_status(rtc);
242 return 0;
243}
244
245static int da9052_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
246{
247 int ret;
248 struct rtc_time *tm = &alrm->time;
249 struct da9052_rtc *rtc = dev_get_drvdata(dev);
250
251
252 if ((tm->tm_year < 100) || (tm->tm_year > 163))
253 return -EINVAL;
254
255 ret = da9052_rtc_enable_alarm(rtc, 0);
256 if (ret < 0)
257 return ret;
258
259 ret = da9052_set_alarm(rtc, tm);
260 if (ret < 0)
261 return ret;
262
263 ret = da9052_rtc_enable_alarm(rtc, 1);
264 return ret;
265}
266
267static int da9052_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
268{
269 struct da9052_rtc *rtc = dev_get_drvdata(dev);
270
271 return da9052_rtc_enable_alarm(rtc, enabled);
272}
273
274static const struct rtc_class_ops da9052_rtc_ops = {
275 .read_time = da9052_rtc_read_time,
276 .set_time = da9052_rtc_set_time,
277 .read_alarm = da9052_rtc_read_alarm,
278 .set_alarm = da9052_rtc_set_alarm,
279 .alarm_irq_enable = da9052_rtc_alarm_irq_enable,
280};
281
282static int da9052_rtc_probe(struct platform_device *pdev)
283{
284 struct da9052_rtc *rtc;
285 int ret;
286
287 rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9052_rtc), GFP_KERNEL);
288 if (!rtc)
289 return -ENOMEM;
290
291 rtc->da9052 = dev_get_drvdata(pdev->dev.parent);
292 platform_set_drvdata(pdev, rtc);
293
294 ret = da9052_reg_write(rtc->da9052, DA9052_BBAT_CONT_REG, 0xFE);
295 if (ret < 0) {
296 rtc_err(rtc,
297 "Failed to setup RTC battery charging: %d\n", ret);
298 return ret;
299 }
300
301 ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG,
302 DA9052_ALARM_Y_TICK_ON, 0);
303 if (ret != 0)
304 rtc_err(rtc, "Failed to disable TICKS: %d\n", ret);
305
306 device_init_wakeup(&pdev->dev, true);
307 rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
308 &da9052_rtc_ops, THIS_MODULE);
309
310 if (IS_ERR(rtc->rtc))
311 return PTR_ERR(rtc->rtc);
312
313 ret = da9052_request_irq(rtc->da9052, DA9052_IRQ_ALARM, "ALM",
314 da9052_rtc_irq, rtc);
315 if (ret != 0) {
316 rtc_err(rtc, "irq registration failed: %d\n", ret);
317 return ret;
318 }
319
320 return 0;
321}
322
323static struct platform_driver da9052_rtc_driver = {
324 .probe = da9052_rtc_probe,
325 .driver = {
326 .name = "da9052-rtc",
327 },
328};
329
330module_platform_driver(da9052_rtc_driver);
331
332MODULE_AUTHOR("Anthony Olech <Anthony.Olech@diasemi.com>");
333MODULE_DESCRIPTION("RTC driver for Dialog DA9052 PMIC");
334MODULE_LICENSE("GPL");
335MODULE_ALIAS("platform:da9052-rtc");
336
